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(No Model.)

I. HOGELAND.

LIPTING JACK.

,393. Patented Janus, 1882..

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N. PETERS. Hmm-Limogmphen waahnmm D. C.

UNrra'n Stratres ISRAEL HOGELAND, OF INDIANAPOLIS, INDIANA, ASSIGNOR OF ONE-HALF T0 GEORGE P. ANDERSON, 0F SAME PLAGE.

Llt-'TING-JACK.

SPECIFICATION forming part of Letters Patent No. 259,393, dated June 13, 1882.

` Application tiled October 31, 1881. (No model.)

To all lwhom it may concern:

Be it known that I, lsaAnL HoenLAND, of the city oflndianapolis, county ot' Marion, and State ofIndi-ana, have invented certain new and usefullmprovementsinLifting-Jacks,ofwhich the following is a specification.

My said invention consists of a lifting-jack wherein the lifting is done by a lever applied to a rack-har attached to the liftinghead, as

1o is common, but wherein the said lifting-head is sustained by a column of tluid upon which a piston, which is also attached to saidliftinghead, rests, as will hereinafter be more specifi-Y cally set `forth and claimed.

Referring to the accompanying drawings, which are made a part hereof, and on which similar letters of reference indicate similar parts, Figure l is a side elevation of my improved jack Fig. a vertical section therezc. of on the dotted line m w in Fig. 3; Fig. 3, a horizontal section, looking downwardly from the dotted line y y; and Fig. 4, a horizrntal section, lookingdownwardly from the dotted line z z. In said drawings, the portion marked A is the main casting of thejack, which is in substantially the form of a double cylinder, as shown, and has wings A A upon its sides, in which are bearings for the lever by which the 3o jack is operated.

The portion marked B is the piston, which moves up and down in the cylinder a, and is supported by the oil or other fluid therein when the jack isbeing operated.

The portion marked C is the lifting-head, which is mounted upon the tops or the piston B and the rackbar D and connects said tw parts together.

The portion marked D is a rackbar con- 4o nected to thelit'ting-head C and passing down outside the cylinder A, against which it rests, between the arms A A', where it enga ges with the lever.

The portion marked E is the lever by which the lifting-head is forced upward, and which rests on a pivot, e, in bearings in the arms A. It preferably has a toothed head, E', pivoted thereto by the pivot e', which engages with the rack-bar D,though a segment-shaped head 5o on the lever itself would answer substantially the same purpose. The form of the bearings being elongated allows the lever to recede slightly,as is necessary, while the head E', being mounted on a pivot, can be turned back, so

as to be entirely disengaged from the rack when the lever is dropped down. The pivot e', however, is not intended to serve any further purpose than that of securing the lever E and head E from becoming disengaged,

as the end of said lever enters a recess in said 6o head, as shown by the dotted line in Fig. 2, and lifts directly against it, which is much Safer than lifting' upon the pivot.

The cylinders c and a are connected together at thebottom by apassage way, through which the oil or other liquid will freely How. At a point therein, preferably close to the bottom ot' the cylinder a, is a valve, a2. It is pret'- erably mounted upon a plain seat and has pins or guides projecting upwardly in the form 7o of a fork, between which a pin, a4, passes across the cylinder a, and thus prevents said valve from being thrown out of position. A small spring, a3, may surround these upwardly-pro. jecting pins, as shown, beneath the pin a, and the valve may be thus vforcibly held to its seat, except when lifted by the greater force of the liquid when the jack is operated.

An orifice is formed between the cylinders a and a, through the wall in the casting A, 8o which divides them at a point just above the valve. This orice is opened or closed bythe cook a5.

A plug, F, should be inserted in the top of the cylinder a to keep out the dirt, anda stopcock may, if desired, be inserted therein, so that said cylinder may be cntirel y closed when the jack is not in use.

The operation of my said invention is as fol- 5 lows: When itis desired to use the jack the 9o piston B is lowered nearly to the bottom ofthe cylinder a and the remaining portion of said cylinder and thel cylinder a'is lled with a liquid, (preferably oil.) The jack is then set under the object to be lifted and the liftinghead is forced upward by manipulating the lever E in the usual manner, as will be readily understood, the cock a5 being closed during the lifting process. As the parts D, O, and B are lifted by the lever the oil flows into the roo space vacated by the piston B, and its egress being prevented by the check-valve a2 sus- -tains said parts in the position to which they :the cock a5 open, when the oil will ow from the chamber a to the chamber a', and the parts B, C, and D will sink ot' their own weight, or by the combined weight of themselves and the load thereon to the lowest point which they are by the construction of the jack permitted to reach.

The advantage of a jack of this construction over the ordinary form of jacks is that no dogs or Apawls are necessary to hold the load when lit'ted at any point, while the ordinary rack and toothed lever can Abe employed. It is also superior in that the parts B C D are sustained in substantially exactly the position to'which they are lifted, as the oil follows the piston closely and does not allow it to recedeV any perceptible distance.

Having thus fully described my said invention, what I claim as new, and desire to secure by Letters Patent, is-

l. In the main casting ot' a lifting-jack, a

cylinder in which a piston moves, a second cylinder or receptacle containing a liquid, a checlrvalve located in the bottom of the first, or between the two cylinders, an oritice between said two cylinders above the valve, and a cock whereby said orifice may be either opened or closed, whereby when the piston is -raised the liquid may be caused to sustain the same, and afterward by opening the cock the piston may be allowed to descend, substantially as set forth.

2. The combination of t-he two cylinders, the liquid contained therein, the valve, the cock, the piston, the rack-bar connected at the top to said piston, and the lever whereby said rack-bar may be forced upward, substantially as described, and for the purpose specified.

3. The combination of the casting A, the cylinders a a', the valve a2, the cock a5, the piston B, head C, rack-bar D, lever E, and head E', substantially as described, and for the purposes specified.

4. In a lifting-jack, the piston B, adapted to be lifted by a lever and sustained or let down by theuseofaliquid,snbstantially asdescribed, and for the purpose speciled.

5. In a lifting-jack, the combination, with the casting A, having wings A A', of a lever, E, supported by a pivot, c, resting in elongated bearings in said wings, a head, E', having a recess into whichthe end of said lever enters, and a rack-bar connected'with the lifting-head of the jack, with which said head E engages, all substantially as shown and described, and for the purposes specified.

In witness whereof I have hereunto set my hand and seal at Indianapolis, Indiana, this 27th day of October, A. D. 1881..

ISRAEL HOGELAND.

In presence of C. BRADFORD, J. G. PAYNE.

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